Observation of a (Lambda Lambda)He-6 double hypernucleus
Observation of a (Lambda Lambda)He-6 double hypernucleus
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DOI：
10.1103/physrevlett.87.212502
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发表时间：
2001-11
影响因子：
8.6
通讯作者：
H. Takahashi;C. Kim;K. Oyama;A. Ichikawa;B. Bassalleck;M. Ieiri;J. H. Chung;T. Kouketsu;
中科院分区：
文献类型：
--
作者：
H. Takahashi;C. Kim;K. Oyama;A. Ichikawa;B. Bassalleck;M. Ieiri;J. H. Chung;T. Kouketsu;
A double-hyperfragment event has been found in a hybrid-emulsion experiment. It is identified uniquely as the sequential decay of ( 6)(LambdaLambda)He emitted from a Xi(-) hyperon nuclear capture at rest.首次测量了 ( 6)(LambdaLambda)He 的质量和 Lambda-Lambda 相互作用能 DeltaB(LambdaLambda)，避免了由于激发态的可能性而产生的歧义。 The value of DeltaB(LambdaLambda) is 1.01+/-0.20(+0.18)(-0.11) MeV. This demonstrates that the Lambda-Lambda interaction is weakly attractive.
A double-hyperfragment event has been found in a hybrid-emulsion experiment. It is identified uniquely as the sequential decay of ( 6)(LambdaLambda)He emitted from a Xi(-) hyperon nuclear capture at rest. The mass of ( 6)(LambdaLambda)He and the Lambda-Lambda interaction energy DeltaB(LambdaLambda) have been measured for the first time devoid of the ambiguities due to the possibilities of excited states. The value of DeltaB(LambdaLambda) is 1.01+/-0.20(+0.18)(-0.11) MeV. This demonstrates that the Lambda-Lambda interaction is weakly attractive.